초록

The invention herein relates to a surface protective dendritic polymer composition and to the cross-linked surface protective coating formed therefrom.

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1. A coating composition comprising: a first component comprising: a hydroxyl functional dendritic polymer;a plurality of metal oxide nanoparticles encapsulated in a hydroxyl functional polymer and/or a hydroxyl functional fluorosurfactant;a catalyst; anda first solvent in which the above materials

1. A coating composition comprising: a first component comprising: a hydroxyl functional dendritic polymer;a plurality of metal oxide nanoparticles encapsulated in a hydroxyl functional polymer and/or a hydroxyl functional fluorosurfactant;a catalyst; anda first solvent in which the above materials are dissolved or, in the case of the nanoparticles, dispersed; anda second component comprising: a cross-linking agent, anda second solvent which may be the same as or different from the first solvent; wherein:the first and second components are mixed together to form the coating composition. 2. The coating composition of claim 1, wherein the hydroxyl functional dendritic polymer has a hydroxyl functionality of 40 to 80. 3. The coating composition of claim 2, wherein the hydroxyl functional dendritic polymer is a highly-branched polyester having a hydroxyl functionality of 64. 4. The coating composition of claim 1, wherein the first component further comprises an acrylic polyol. 5. The coating composition of claim 4, wherein the acrylic polyol has a hydroxyl functionality of 2 to 6. 6. The coating composition of claim 1, wherein the hydroxyl functional fluorosurfactant is a hydroxyl functional fluorinated methacrylate polymer. 7. The coating composition of claim 1, wherein the plurality of encapsulated metal oxide nanoparticles is selected from the group consisting of encapsulated aluminum oxide nanoparticles, encapsulated zinc oxide nanoparticles and combinations thereof. 8. The coating composition of claim 7, wherein the encapsulated aluminum oxide nanoparticles are provided in a dispersion or suspension. 9. The composition of claim 7, wherein the encapsulated zinc oxide nanoparticles are provided in a dispersion or suspension. 10. The coating composition of claim 1, wherein the plurality of encapsulated metal oxide nanoparticles comprises a mixture of encapsulated aluminum oxide nanoparticles and encapsulated zinc oxide nanoparticles, provided in a dispersion or suspension. 11. The coating composition of claim 1, wherein the hydroxyl functional polymer is a hydroxyl functional silicone acrylate. 12. The coating composition of claim 11, wherein the hydroxyl functional silicone acrylate is a hydroxyl functional silicone polyacrylate. 13. The coating composition of claim 1, wherein the first component further comprises a sterically hindered amine light stabilizer. 14. The coating composition of claim 1, wherein the first component further comprises a UV absorber. 15. The coating composition of claim 14, wherein the UV absorber is a hydroxyphenylbenzotriazole UV absorber. 16. The coating composition of claim 1, wherein the first solvent is anhydrous acetone and propylene glycol methyl ether acetate. 17. The coating composition of claim 1, wherein the cross-linking agent is a polyisocyanate. 18. The coating composition of claim 17, wherein the polyisocyanate has an isocyanate functionality of from 2 to 6. 19. The coating of claim 18, wherein the catalyst is dibutyltin diacetate. 20. The coating of claim 1, wherein the cross-linking agent is a melamine formaldehyde resin. 21. The coating composition of claim 20, wherein the melamine formaldehyde resin is hexa(methoxymethyl)melamine. 22. The coating composition of claim 1, where the second solvent is a mixture of acetone and propylene glycol methyl ether acetate or a mixture of methyl ethyl ketone and propylene glycol methyl ether acetate. 23. The coating composition of claim 1, wherein the first component comprises: a hydroxyl functional dendritic polymer, wherein the hydroxyl functional dendritic polymer is a highly-branched polyester having a hydroxyl functionality of 64;an acrylic polyol;aluminum oxide nanoparticles encapsulated in a hydroxyl functional silicone polyacrylate, provided in a dispersion or suspension;zinc oxide nanoparticles encapsulated in a hydroxyl functional silicone polyacrylate, provided in a dispersion or suspension;a sterically hindered amine light stabilizer;a hydroxyphenylbenzotriazole UV absorber;a dibutyltin diacetate catalyst; anda mixture of anhydrous acetone and propylene glycol methyl ether acetate; and the second component comprises:a polyisocyanate cross-linking agent having an isocyanate functionality from 2 to 6; anda mixture of acetone or methyl ethyl ketone and propylene glycol methyl ether acetate; wherein:the first and second components are mixed together to form the coating composition. 24. The coating composition of claim 23, further comprising a hydroxyl functional fluorinated methacrylate polymer fluorosurfactant. 25. The coating composition of claim 1 wherein the first component comprises: a hydroxyl functional dendritic polymer, wherein the hydroxyl functional dendritic polymer is a highly-branched polyester having a hydroxyl functionality of 64;an acrylic polyol, wherein the acrylic polyol has a hydroxyl functionality of 2 to 6;aluminum oxide nanoparticles encapsulated in a hydroxyl functional silicone polyacrylate, provided in a dispersion or suspension;zinc oxide nanoparticles encapsulated in a hydroxyl functional silicone polyacrylate, provided in a dispersion or suspension;a sterically hindered amine light stabilizer;a hydroxyphenylbenzotriazole UV absorber;an acid catalyst; anda mixture of anhydrous acetone and propylene glycol methyl ether acetate; and the second component comprises:a hexa(methoxymethyl)melamine formaldehyde resin; anda mixture of acetone or methyl ethyl ketone and propylene glycol methyl ether acetate; wherein:the first and second components are mixed together to form the coating composition. 26. The coating composition of claim 25, wherein the acid catalyst is a sulfonic acid. 27. The coating composition of claim 26, wherein the sulfonic acid is selected from the group consisting of p-toluene sulfonic acid and dodecylbenzyl sulfonic acid. 28. The coating composition of claim 25, further comprising a hydroxyl functional fluorinated methacrylate polymer fluorosurfactant. 29. The coating composition of claim 1, wherein the first component comprises: a hydroxyl functional dendritic polymer, wherein the hydroxyl functional dendritic polymer is a highly-branched polyester having a hydroxyl functionality of 64;an acrylic polyol, wherein the acrylic polyol has a hydroxyl functionality of 2 to 6;aluminum oxide nanoparticles encapsulated in a hydroxyl functional fluorinated methacrylate polymer, provided in a dispersion or suspension;zinc oxide nanoparticles encapsulated in a hydroxyl functional fluorinated methacrylate polymer, provided in a dispersion or suspension;a sterically hindered amine light stabilizer;a hydroxyphenylbenzotriazole UV absorber;a dibutyltin diacetate catalyst; anda mixture of anhydrous acetone and propylene glycol methyl ether acetate; and the second component comprises:a polyisocyanate crosslinking agent having an isocyanate functionality from 2 to 6; anda mixture of acetone or methyl ethyl ketone and propylene glycol methyl ether acetate; wherein:the first and second components are mixed together to form the coating composition. 30. A surface protective coating, comprising the coating composition of claim 1 after it has been deposited on a substrate surface, cured and dried. 31. A method of forming a surface protective coating on a substrate surface, comprising: providing a coating composition of claim 1;depositing the coating composition on the substrate surface no more than about one hour after mixing the first and second components; andcuring the deposited coating composition. 32. The method of claim 31, wherein curing comprises heating the deposited coating composition.